[MM-52380] Fix unhandled rejection when clearing app cache (#2696)

* [MM-52380] Fix unhandled rejection when clearing app cache

* Make sure the window is loaded first

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

src/main/app/initialize.ts

@@ -345,11 +345,6 @@ async function initializeAfterAppReady() {
         updateSpellCheckerLocales();
     }
 
-    if (wasUpdated(AppVersionManager.lastAppVersion)) {
-        clearAppCache();
-    }
-    AppVersionManager.lastAppVersion = app.getVersion();
-
     if (typeof Config.canUpgrade === 'undefined') {
         // windows might not be ready, so we have to wait until it is
         Config.once('update', () => {
@@ -472,6 +467,11 @@ async function initializeAfterAppReady() {
         callback(urlUtils.isTrustedURL(requestingURL, serverURL));
     });
 
+    if (wasUpdated(AppVersionManager.lastAppVersion)) {
+        clearAppCache();
+    }
+    AppVersionManager.lastAppVersion = app.getVersion();
+
     handleMainWindowIsShown();
 }
 

src/main/app/utils.ts

@@ -91,7 +91,11 @@ export function clearAppCache() {
     // TODO: clear cache on browserviews, not in the renderer.
     const mainWindow = MainWindow.get();
     if (mainWindow) {
-        mainWindow.webContents.session.clearCache().then(mainWindow.reload);
+        mainWindow.webContents.session.clearCache().
+            then(mainWindow.webContents.reload).
+            catch((err) => {
+                log.error('clearAppCache', err);
+            });
     } else {
     //Wait for mainWindow
         setTimeout(clearAppCache, 100);